Device for finishing cylindrical surfaces



March 4, 1930. G. R. MAUPIN I DEVICE FOR FINISHING CYLINDRICAL SURFACES Filed Oct. 19, 1928 2 Sheets-Sheet l March 4, 1930. G. R. MAUPIN FOR FINIS HING CYLINDRICAL SURFACES Filed Oct. 19, 1928 2 Sheets-Sheet 2 35 suresherein given. V. d To: this end, my invention consists-in the novel arrangement, construction and combi- I nationof-parts herein showndand described 1.

;and more particularly pointed out :in the claims I H I Patented Mar. '4, 1930 eRAvEs B. ivnwrmpon MQBERLY, MiSSOURI I I :onvIcli. son rinrsnme .cYLInnnIoAL' summons Application filed ember 19, 928: seriarno; 313,628. I

7 My invention relates to improvementsin a v device for fin'lshlng cyllndrlcal surfaces, and

has among its obj acts the construction of such a device which shall be simple, convenient,

' compact, easy to use, accurate, and .efficientand Satisfactory r l e' er sundae plicable. I

A 'fu'rtherobject of my invention to pro-1 [vide device of thekind described, which 10 shall be operable to smooth or otherwise finish'a cylindrical bearing surface, and more particularly triple valve pistonfbushings,

without the necessity fof'the device being .moved axially therealong, 'afterihedevice I has been' arranged in. place to engage said cyllndrlcal bearlng surface.

1 7 Other objects of my invention are to 0011-.

" 'struct a device of the kind described, which,

can be used for not only smoothing. out. and I finishing these cylindrical bearing surfaces,

but which "will. toughen or harden them and I :improve, them for the purpose forfwhichthey '30 are tobeused- I .I Many other objectsland advantages ofv the co-op'erate withthefouter andfinne'r'ends of I the rollers. YA oarriermember or element 8.

construction herein-shown and described -will b'e'lobvioustothose skilledinithe art to which.

; this invention appertainagfrom the disclo- In the drawings, wherein Iiker'eference charactersnnd cate like or correspondmg par-ts throughout thevviews.

Figure .1. is aplan view device; 7. 1

Figure2 is a sideelevationof the s ine} Figure 3 is a. cross-sectional view. taken substantially I. along the ,line III-+11 1. of

A further object of myinvention isito' aim;

faced to true dimensions.

, the roller ele'ments 5. therein. 'A.-pair of end is a cross-sectional 'view taken substantially 2; and 1 -Fi' re 5 :is a cross sectionalv view taken substantially-along the line V5-Vof F ig'.4.

In the drawings,'wherein I have illustrated the preferred embodiment. of my=invention;

there is showna portion of any desir'edmech' anism 1; such as a railway triple va1ve,;p11m p,

or in fact a mechani'sm of any nature; and hav ng a cylindricalfloearlng surface, :which may 'be. formed directly. from the material or as a separate element as shown at 2.

f These cylindricalbearingsurfaces mustbe I I v V I very carefully maintained smooth and per-*- fectly cylindrical'so as to most eflicientlyper= their intended functions. Iflthey be come, scored or lined,'or in any other way become .cut or defective, they must'be re-sur- My improved device. is intended notonly for originally truingQup ,these cylindrical surface's'pbut forirenewing such surfaces;

after' they have become, worn or are other: wise defective. I .7

As shown, a cage element 3 .is provided, formed with a plurality ofcircumferentially periphery and adapted :to.v rotatably. receive orv thrustrings 6. and '7, i may be provided nto is constructed to removablyireceive the cage.

gagelnent therewith, the innerth'rust ring 7 I fitting between theparts 3 andS as shown I Th6,-- roller, elements: are preferably long Q enough to bear upon and engage'with thefull axial length'of the bearing-surface to be fin ished or otherwise treated, so gthatafter the tool has, been placed inv operative position," itneed not be moved axially ofsuch cylindrical bearing surface, and hence thework may:

be more easily and quickly performed, and-.-

without the danger, of forming grooves, or

1 PATENT )QF FiCEiF 7,; i

I out f which' the mechanism is constructed, i

"spaced openings orslotslarounditsouter,

ridges. or other uneven surfaces onsuch bear? ings. I

A tapered rnandrel r wedge rnelnber 9 l is arranged to operate withint-he hollow cage element, preferably by having thread d n l is again noted that the entire axial length of element, said mandrel preferably having a tapered outer surface, engageable with the roller elements. Obviously, if the rollers are held in contact with the cylindrical surface to be treated, and against axial movement, any longitudinal movement of the mandrel (to the right in Fig. 4) must necessarily actuatli these rollers radially outwardlyto increase their effective working radius and cause them topress more firmly against the cylindrical bearing surface 2. a

The mandrel is provided with a keyed opening therethrough so as to fit upon one end of a shaft 10, said shaft having an enlarged section 11 adjacent the portion '10, and a radial enlargement or-fiange 12 beyond said portion 11. The mandrel is held in place against axial, as well as rotative, movement relatively of the shaft, between the shoulder provided at the end of the shaft section 11 and a nut 13. In this mannerany movement of the mandrel will be transmitted directly" to the shaft. V V

A collar element 14 is preferably threadedly engageable with the element 8 so, as to have rotative movement relative thereto when desired, said collar being bored to -slidably' receive the portion 11 of the shaft. A thrust bearing 15 may be interposed between the flange 12 of the shaft and the collar element, and an end plug or closure member 16 is preferably threaded to engage with the collar and to abut the flange 12, to thereby clamp the collar against movement axially of the shaft, while permitting movement rotatively there-' of The parts 8 and 14 may be detachably in;

terlocked against any relative movement, by

any suitable means, as by providing a set screw aperture in the element 8, into which opening the set screw 17 may be inserted. to

engage with the part 14. If desired, a piece the bearing surface is engageable by the rollers, so that after the tool has once been inserted in place, it is not necessary to feed it along such cylindrical bearing surface.

The tool is then turned so that the rollers roll along the bearing surface 2, the member 8 being provided with a handle-receiving opening at some point thereon for a removable operating handle 19.

As soon as the rollers roll easily and smoothly along the bearing surface, the set screw 17 maybe loosened and the collar moved in a direction away from the part 8, (to the right as shown in Fig. 4) while holding the part 8 fixed. This movement of the collar, relatively of the part 8, maybe accomplished by any suitable tool, as by providing a removable bar 20 to engage with the collar, and such movement will actuate the shaft outwardly of the bearing being finished, such movement causing the mandrel carried thereby to move together therewith, and the roller elements will be actuated radially outwardly by the movement of the mandrel outwardly of the bearing surface, after. which the set screw may be retightene'd and the member 8 rotated again. l 1

When the effective rolling diameter of the rollers have been increased to thedesired extent, the carrier member 8 may again be oscil-' lated to smooth the bearing surface, thisoperation of backing out the mandrel and smoothing of the bearing surface being repeated as often as is necessary. V A

In order to accurately control the amount of expansion of the rollers, a micrometer scale 21 may be provided between the co-operating elements 8 and 14, somewhat as shown, and

whereby any predeterminedamount of ad justment between the elements may be had.

Having-thus described, my invention, it is obvious that various immaterial changes may be made in the same; hence I do not wish to be understood as limiting myselfto the exact form, construction, arrangement and combination of parts herein shown and described, or uses mentioned, except as limited by the claims.

is that it is the cage and not the mandrel which is rotated However the mandrel does turn out, my present device is intended primarily for refinishingthe bushings of triple valves,

such as are used in connection with brake cylinders on locomotives, railway and rolling stock, and is intended primarily, as aforesaid,

to refinish the piston cylinder bushingswhich have become scored in any manner and with: out removlng any metal whatsoever from these bushings. In other words, by the use of my device any score marks or grooves, which are formed during the operation of the valve, are ironed out so that no removal of metal is necessary. f T 1 Having fully described my invention, what I claim is 1. An apparatus of the kind described, com

prising a cage member, a plurality of rollers rotatably mounted therein at spaced points. thereabout, a tapered expander contacting -with said rollers, a shaft'carrying said expander and fixed thereto, aremovable handle for rotatably operating said cage member, a

. size-adjusting means provided with a sizein- An" important feature of my present device dicating gauge rotatably mounted in said cage 7 -member and adjustably movable relative to said cage, and a removable bar for adjusting said last-mentioned means to move the shaft and expander carried therebylongitudinally,

wherebysaid expander will. actuate said r011 ers radially. p

2. A device of the class described comprisrollers slidably carried by said cage and adapted to be projected beyond the periphery 7 thereof, a tapered member located Within said I cage and contacting with said rollers, a rotatable shaft for supporting said tapered memhere, a screw threaded element carried by said cage for supporting saidshaft, and a removable bar carried by said threaded element for rotating the same independently of the cage for moving said element longitudinally of the cage whereby said tapered member is moved longitudinally and said tapered rollersbodily moved outward.

I 3. A device of the class described compris- 7 ing arotary cage member, a' detachablehandle carried by said member, spaced apart tapered I rollers slidably carried by said cage and adapted to beprojected beyond the periphery thereof, a tapered member located within said cage and contacting with said rollers, a rotatableshaft for supporting said tapered members, a screw threaded element having. a micrometer gauge thereon carried by said cage for supporting said shaft, and a removable bar carried by said threaded element for rotating the'same independently of the cage for 1 moving said element longitudinally of the V cage whereby said element and tapered members are simultaneously moved longitudinally and said tapered rollers bodily moved out ward. I i f V In testimony whereof I have a-fiix'ed my signature.

GRAVES R. MAUPIN.

mg a rotary cage member, a detachable handle carried by said member, spaced apart tapered 

